[CI] Use drone plugin to build docker image

.drone.yml

@@ -32,28 +32,38 @@ steps:
 ---
 kind: pipeline
 name: build
+#
+#steps:
+#- name: build image
+#  image: docker
+#  environment:
+#    DOCKER_HOST: tcp://docker
+#    USERNAME:
+#      from_secret: dockerhub_username
+#    PASSWORD:
+#      from_secret: dockerhub_password
+#  commands:
+#  - docker build -t kleph/beer .
+#  - docker login -u $USERNAME -p $PASSWORD
+#  - docker image push kleph/beer
+#
+#services:
+#- name: docker
+#  image: docker:dind
+#  environment:
+#    DOCKER_TLS_CERTDIR: ""
+#  command: ["--storage-driver=vfs", "--tls=false"]
+#  privileged: true
 
 steps:
 - name: build image
-  image: docker
-  environment:
-    DOCKER_HOST: tcp://docker
-    USERNAME:
+  image: plugins/docker
+  settings:
+    repo: kleph/beer
+    username:
       from_secret: dockerhub_username
-    PASSWORD:
+    password:
       from_secret: dockerhub_password
-  commands:
-  - docker build -t kleph/beer .
-  - docker login -u $USERNAME -p $PASSWORD
-  - docker image push kleph/beer
-
-services:
-- name: docker
-  image: docker:dind
-  environment:
-    DOCKER_TLS_CERTDIR: ""
-  command: ["--storage-driver=vfs", "--tls=false"]
-  privileged: true
 
 depends_on:
 - lint